# US 7,743,840 B2 · Lawn aerating device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,743,840 B2 - Document ID: US7743840B2 - Status: Granted - Kind: B2 - Application number: 12/050,474 - Filed: 2008-03-18 - Published: 2009-09-24 - Granted: 2010-06-29 - Earliest claimed: 2008-01-10 - Inventors: Joseph E. Hoffman - Web page: https://patentgrep.com/patent/US7743840B2 ## CPC - A01B 45/02: for aerating - A01B: SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL (making or covering furrows or holes for sowing, planting or manuring A01C5/00; mowers convertible to soil working apparatus or capable of soil working A01D42/04; mowers combined with soil working implements A01D43/12; soil working for engineering purposes E01, E02, E21) ## Abstract In accordance with the present invention an aerating device for attachment to a self-propelled lawnmower is provided. The device comprises a frame having a proximal end, a distal end, and a pair of sides extending between the proximal end and the distal end. An axle is mounted to the frame and extends between the sides of the frame. At least one tine assembly is mounted to the axle for rotation about a tine axis extending longitudinally through the axle. A platform is secured to the frame and extends outwardly from one of the proximal and distal ends of the frame for supporting an operator. ## Claims ### Claim 1 A combination of an aerating device attached to a self-propelled lawnmower, the combination comprising: the self-propelled lawnmower comprising: a receiver extending outwardly from a back end of the self-propelled lawnmower; and a pair of handles extending upwardly and rearwardly from the self-propelled lawnmower on opposing sides of the receiver for steering for the self-propelled lawnmower; the aerating device comprising; a frame having a proximal end, a distal end, and a pair of sides extending between the proximal and distal ends; an axle mounted extending laterally between the sides of the frame; at least one tine assembly mounted for rotation about a tine axis extending longitudinally through the axle, the tine assembly having a tine diameter; an attachment mechanism secured to the proximal end of the frame and attached to the receiver of the self-propelled lawnmower as to permit rotation of aerating device relative to the self-propelled lawnmower about an axis that extends through the receiver and is substantially transverse to a direction of travel of the self-propelled lawnmower; and a platform secured to the distal end of the frame opposite the attachment mechanism for supporting an operator behind the at least one tine assembly to facilitate gripping the handles of the self-propelled lawnmower, the platform extending outwardly from the frame at an elevation that resides between vertical extents of the tine diameter, whereby weight of an operator on the platform causes rotational force of the aerating device about the axis so that tines closest to the ground transfer the weight of the operator to the ground for penetration of such closest tines into the ground for performing aeration in the direction of travel of the self-propelled lawnmower. ### Claim 2 (depends on 1) The combination of claim 1, wherein the axle and the platform of the aerating device lie in substantially the same plane. ### Claim 3 (depends on 1) The combination of claim 1, further comprising means for selectively engaging and disengaging the at least one tine assembly for aeration. ### Claim 4 (depends on 3) The combination of claim 3, wherein the means for selectively engaging and disengaging the at least one tine assembly comprises at least one wheel, the at least one wheel is movable relative to the frame from a first position below the frame in which the at least one tine assembly is disengaged to prevent penetration of the tines into the ground, to a second position in which the at least one tine assembly is engaged to provide for penetration of tines into the ground during aeration. ### Claim 5 (depends on 3) The combination of claim 3, wherein when the tines are engaged for aeration, the tines closest to the ground are about the only portion of the aerating device able to transfer the weight to the ground, thereby causing the tines to engage and penetrate the ground for aeration in the direction of travel of the self-propelled lawnmower. ### Claim 6 (depends on 3) The combination of claim 3, wherein the attachment mechanism of the aerating device further comprises: a post secured to one of the proximal end or the distal end of the frame opposite the platform; and a hitch comprising a tubular portion, an arm, and a forked member, wherein the tubular portion is slidably mounted on the post and the forked member is releasably attached to receiver of the lawnmower. ### Claim 7 (depends on 6) The combination of claim 6, wherein a position of the hitch is variable along the post. ### Claim 8 (depends on 6) The combination of claim 6, wherein the hitch is disposed at a height above the height of the axle relative to the ground. ### Claim 9 (depends on 6) The combination of claim 6, wherein the hitch is movable about at least two axes relative to the post. ### Claim 10 (depends on 1) The combination of claim 1, wherein the at least one tine assembly comprises a hub having a plurality of projections extending radially therefrom, a tine extends radially from each of the plurality of projections. ### Claim 11 (depends on 10) The combination of claim 10, wherein each tine is one of releasably engageable with each projection or permanently attached to each projection. ### Claim 12 (depends on 1) The combination of claim 1, wherein the at least one tine assembly comprises a plurality of tines coupled to the axle, the tines rotating through first and second spaced apart planes that define the vertical extents of the tine diameter are substantially parallel with a third plane, the third plane being substantially co-planar with the platform and being located between the first and second plane. ### Claim 13 (depends on 1) The combination of claim 1, further comprising an adjustable attachment for connecting the platform adjustable relative to the frame at a plurality of selectable heights between the vertical extents of the tine diameter. ### Claim 14 (depends on 1) The combination of claim 1, wherein the at least one tine assembly comprises a plurality of tine assemblies, each of the plurality of tine assemblies being freely rotatable about the tine axis to aerate the ground. ### Claim 15 (depends on 14) The combination of claim 14, wherein the plurality of tine assemblies are spaced apart along the axle a distance that at least approximates a wheel base of the lawnmower. ### Claim 16 (depends on 1) The combination of claim 1, further comprising at least one wheel secured to the platform to provide support and stability for the operator on the platform. ### Claim 17 A combination of an aerating device attached to a self-propelled lawnmower, the combination comprising: the self-propelled lawnmower comprising a pair of handles extending upwardly and rearwardly from a body of the self-propelled lawnmower for steering for the self-propelled lawnmower; and the aerating device comprising: a frame having a proximal end, a distal end, and a pair of sides extending between the proximal and distal ends; a plurality of tine assemblies mounted for rotation about a tine axis extending through the pair of sides of the frame, each of the plurality of tine assemblies comprising a plurality of tines configured to rotate about the tine axis through first and second spaced apart planes; an attachment mechanism secured to the proximal end of the frame and attached to a back end of the self-propelled lawnmower as to permit free rotation of aerating device relative to the self-propelled lawnmower about a fulcrum axis that extends laterally through the attachment mechanism between the proximal end of the frame and the self-propelled lawnmower substantially transverse to a direction of travel of the self-propelled lawnmower; and a platform secured to distal end of the frame opposite the attachment mechanism for supporting an operator behind the tine assemblies to facilitate gripping the handles of the self-propelled lawnmower, the platform extending outwardly from the frame at an elevation that resides in a third plane that is substantially parallel with and located between the first and second planes, wherein weight of an operator on the platform causes rotation of the aerating device about the fulcrum axis; a retraction device that is configured to selectively engage and disengage the tines for performing and terminating aeration, such that, when the tines are engaged, the rotation of the aerating device about the fulcrum axis causes tines closest to the ground to transfer the weight of the operator to the ground for penetration of the closest tines into the ground for performing aeration in the direction of travel of the self-propelled lawnmower. ### Claim 18 (depends on 17) The combination of claim 17, further comprising an adjustable attachment for connecting the platform relative to the frame at a plurality of selectable heights between the first and second planes. ### Claim 19 (depends on 17) The combination of claim 17, wherein the self-propelled lawnmower further comprises a receiver at a back end of the self-propelled lawnmower; and wherein the attachment mechanism is configured to mating attachment with the receiver of the self-propelled lawnmower to provide for the rotation about the fulcrum axis, the attachment mechanism further comprising: a post secured to one of the proximal end or the distal end of the frame opposite the platform; and a hitch comprising a tubular portion, an arm, and a forked member, wherein the tubular portion is slidably mounted on the post and the forked member is releasably attached to receiver of the lawnmower. ### Claim 20 (depends on 19) The combination of claim 19, wherein the hitch is movable about at least two axes relative to the post.